Long-term constipation can be caused by many factors and is not a symptom unique to bowel cancer, so constipation symptoms alone cannot diagnose bowel cancer. Some patients with bowel cancer can have constipation symptoms, but the early symptoms of bowel cancer are not particularly obvious and can be easily ignored, thus delaying the treatment. Bowel cancer is mostly associated with abdominal pain, bloating, blood in stool, anemia, weight loss and other symptoms, and rectal cancer may also show symptoms such as urgency and unpleasant stool. In addition, long-term constipation can also be caused by other factors, such as too little diet or insufficient fiber and water in food; insufficient power of defecation; neglect of bowel movement and insufficient stimulation of intestines; long-term use of laxatives, etc. If constipation persists, colorectal examination should be performed to clarify the exact cause of constipation, and if necessary, pathological testing of intestinal masses can also be performed, which can help the differential diagnosis of intestinal cancer. Therefore, patients with chronic constipation should go to gastroenterology or colorectal surgery for detailed examination in time to further confirm the diagnosis and take targeted treatment, which can help relieve constipation.